Examine source code of Electric Twilight

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Electric Twilight",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_text": "rgb(67, 194, 218)",
      "frame": "rgb(122, 9, 210)",
      "tab_background_text": "rgb(218, 4, 247)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgb(67, 194, 218)",
      "tab_line": "rgb(203, 25, 227)",
      "popup": "rgb(35, 30, 102)",
      "popup_text": "rgb(218, 4, 247)",
      "button_background_active": "rgb(122, 9, 210)",
      "icons": "rgb(17, 211, 248)",
      "sidebar_border": "rgba(0, 0, 0, 0)",
      "toolbar_field_border_focus": "rgba(0, 0, 0, 0)",
      "toolbar_field_border": "rgba(0, 0, 0, 0)",
      "tab_loading": "rgb(203, 25, 227)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f01b884-eb96-4ffe-9395-ca5af57a02b0}"
    }
  }
}